#include<bits/stdc++.h>
using namespace std;
using i64 = long long;
int main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int n;
cin >> n;
assert(n == 2);
vector<pair<int,int>> a(n);
for(int i = 0;i < n;i++){
int x,y;
cin >> x >> y;
a[i].first = x;
a[i].second = y;
}
int ans = 2;
if(abs(a[0].second - a[1].second) >= abs(a[0].first - a[1].first)) ans --;
cout << ans << '\n';
return 0;
}
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